Surgical instrument



Nov. 14, 1.933. w G, RlCHTER 1,934,818

SURGICAL INSTRUMENT Filed July 8. 1930 I *Pat-exitedl Noia-i4, fr 1 *y UNITED STATES PATENT OFFICE;

scission INSTRUMENT n s f .sustain Richterirbklyn,N..Y. QAppiicatio'n July s, `l193m` serial No,466,426;'ey l 13 claims. "(01." 12s-326)' The invention relates tok instrumentsfof. the kind adapted to be operated with two degrees of force and suchior example as atonsilysnare, in

which a preliminary direct" pull, done bythe k5' lingers, serves to make the vinitial contraction. of the snare and is followed by the stronger pull of a'power. screw which completesthe action; rIfhe object is to simplify andfimprovethe durability and the reliabilityoflinstruments of this 'class and to make them capable of easier cleansing4 and more easily taken apart and reassembled, and the inventionziconsists of several features, vwhich are preferablyfconjointly. embodied but arealso ica.- pable 'of independent usewith advantage as will aDpended claims. I

The drawing shows the several improvements inY .The vframe of the instrument .comprises two united at their forwardends by the head 2 which forms a supporting meansi.=for thextubulartip 43 y Lfor guiding the snare wire or 'ther-stilette `4, such g tip being removable by releasing thelatch 5; rlvhe twoislide lbars 1 are'disposed .parallelto each other l and with' the space between'gthem.openstopfand bottom and' are'connectedat theirrear endsby'a cap or socket f6 in which they are heldbyfa lock;4 screw 7, tapped into one-'ofltheside bars and fitting a vcountersink-in the end of the slot 8 inthe socket s wall.V f By backing out the screw the sccketcan be v pulled off thebars. l

.'.The socket-'member '6 forms the rear bearing for the power screwr9, the forward end 'of which is journalled in a bearingllintheheadl, sothat the body of '-thescre'wlies betweeni the two side` bars, occupying substantially the full widthl of the space between them. vThe bearing'pl() is conby which it may be rotated and the socket memit willfnot drop olf when the screw is separated from the frame.

finger'holds 13, embracesv and Vslides on'the two bars, vbeing introduced thereon when the end cap 6 has been removed. It is provided with a halibe made apparent. below andas-dened in thel stituted by a hole slightly larger than the reduced end of the screw which rests thereing, 'A thumbv ring 11 on the end of the screw serves as a handle nut 14'extending intothev space between. the barsA Y and for engagement with the power screw Sibut is' normally clear of such screw.- This half-nut isa rigid part of ythe carriage., The carriage also has asecond half-nut 15,movablyisupported thereon, 60'` onV the opposite side ofthe power screw, anda cam leven-16 by meansl of Awhich this latter half-nuty canfbe advanced upon r the screw with a. suflicient movement to `fshift the latter into engagement with the carriagehalf-nut 14, either by displacing y Vit-in its-lo0se bearings, 10 and ,6, or .by simply v exingg it, or,both, thus clamping the screw `byV and between, the` two half nuts. AByfsuch engagement-the carriage becomes connectedto the screw with less tendency to' wearl ofthe screwA than if 70V onlyA Ya single half-nut were lemployed andfwitn specialsecurityvA due -toftliefimportant fact that,"

.half-nut lelgisA aXed or rigid part of the carriage. Thev'rnanner ofmounting.the'movinghalf-nut 15 on the carriageis subject'to` preference; as: herein 75 s ,Y shown, rit is carried on theend of a substantial' 1 at spring 'lsecured by afscrew atthe front end of theY carriagebody,thefspringbias serving to separate the half-nut from'A the screw. f The operation of` the half-nut by the levers, 16 is also asubf 80; Y

ject of preference; Y as shown, the lever is ofyokeform, separablypivoted at-*18 to the lcarriage and'v engages a cam contour on thebackror lower side of the-half-nut 15 ,`f andit is provided with a trigger end extending below the lower finger hold-13 and 85. f so that when the trigger is pulled it causes engagea ment of the screw'withboth half-nuts.r Y l Y It will belunderstood that ,the smette 4 is' its; tened inrits hole orsocket in the. upperl part of the carriage by theset screw .19, lso. that by pulling 90 back ,on the cvzarriagav with theljingers, the snare can A`be preliminarily. contractedv downl 'to` the vpointfwheremultiplicationof power isn'eededv for further contraction. The triggerjis then-pulled back,` clamping the screwminto `threaded engagementwiththecarriage and then, by rotation `of the thumb ring 11, the carriage can'be yfurther retracted as desired. Over-screwing is .prevented'byV the projection`20 onv the socket' 6` which is encountered by the trigger as the carriage apf proaches the end of the slideway and throwsthe latter-out of its cam notch on its half-'nutsnapping it to open position.

` It will be observedthat the construction of the d frame' with two-side bars Awhose proximate 'faces 105 Y are'iiat, or at least not concaved, adapts it to The carriage 12, provided withjtop and bottombe readily ushedout clean under affaucet and that the connection of the bars at their rear `ends .by a socket, which is ofV square vcross section, Y

' together, these being features independent of the l invention independent of the power sor'ew'organi- Zation as will be apparent and further, thatthe special security of the threaded engagement between screw and carriage is the result of the rigidity of the half-'nut 14 with the carriage and the provision of relative Vmovement between these parts whereby they may be brought-or clamped the construction of the frame.

It will be observed furthermore that. while. the invention has been exemplified and described as embodied in a tonsil snare, the same-principle of construction and operation is` applicable to any mounting or character of the power screw and of surgical instrument wherein a-`carriage is subject to preliminary direct and subsequent power operg ationxand there is therefore no limitation to be `implied-to theparticular use in which the invention jisshown. g v

I-claimz' w A 1.,In an instrument 'adapted for.' Vdirect Yand power operation, the '.combination of` a: sliding carriage, a power screw, and means for shifting the screw vinto threaded engagement with threads onthecarriage. l A Y 2. In an instrument adapted for direct and power operation, f thek combination of* a sliding carriage having a half-nuera power screw, an opposing half'nutandk means causing the latter to shift the screw into engagement with'the cai`` riage half-nut. l Y Y 3. In an Yinstrument adapted for direct and power operation, the -combination of a'sliding carriage having a ringer' grip and a half-nut formed rigidly therewith, a power screw, an opposite-half-nut and means Von the vcarriage `for clamping the latterupon the screw and thereby Vclamping the .screwk into the carriage half-"iut,y

1 4.9In lan instrumentof the l'kind'described, a frame comprising af'slideway, a carriagetlfiereon having a half-nut, apower screw having journals s in the frame permitting moveinent'thereoi laterally of the slideway, a second half-nut and means for clampingY theY latterV half-nut against 'the screwand thereby shifting the latter into engagement with the carriage half-nut. Y o Y y 5. In `an instrument Vof the kind-described-a framecomprisingside bars, a power screw between said bars, a 'carriageon the barswha'vinga half nut between them and means' onfthe` carriagefor laterally shifting thescrew intouengagement with said half-nut.

`6.'In an instrumentVV of the kind described, a

frame comprising two sidebarshaving substantially flat opposing '-faces'and connected -only at their ends, a power r`screw connedbe'tween `said opposing'iaces, a carriage sliding on the upper and lower` edges of said barsY and-means on the carriage for connecting the same to said screw.

'7.In an instrument of connected only at their ends and Vconning a power screw between them, a socket member forming the rear connection between saidvbars, a set screw in one of the bars engaging aY slot in said member, whereby said member is removably secured to said bars, a carriage on said bars and means on the carriage for connecting it to said screw.A i v s B.. Inan instrument of the kind described, a frame comprising two spaced-apart side bars each of substantially flat cross-section, a head uniting the forward end of said bars, a socket connecting fthe rear ends, a power screw jour- ,nalled in the head and socket respectively and open to View top and bottom between said bars,

'a carriage sliding on the upper and lower edges of saidmbars and means on the carriage for connecting it rfor operation by said screw.

9. In an instrument ofthe kind described, a frame comprising twov spaced-apart sidebar's, each of substantially iat cross-section, connected only tat their ends andconning a power screw between them, ak carriage on said bars, means 4Vfor connecting the carriage to the screw, a socket forming the rear Aconnection between said bars and a member .onrsaidfsocket for engaging said connecting means Vto disengagey the screw. and carriage.v 1 Y 10. In an instrument of the kind described, a frame comprising twoyside bars, a headuniting their forward endsa powery screw loosely journalled in the head 'and conned vbetween said bars, a removable socket forming al journal seat ving carriage, 'a half-nut formed thereonv between said bars, a power screw betweensaid bars, and a movable halrn -nut on the carriage adapted for defleetingl the power screw into engagementwith saidA firstgmentioned half-nut. Y i

. `12. In' an instrument 'ofthe kind Vdescribedya frame comprisingtwo side bars having a power Y the kind described, aframe .comprisedoi two spaced-apart side barsV screw,journalled between them, a carriage embracing the opposite edges of said bars and having a half-nut ormed thereon, a second halfnut movablymounted on said carriage and a lever for causing joint engagementV of lsaidrhalf-nuts with the .power screw.. Y

13. In an instrument `of the lkinfildescribed,A a pair ofside bars coniining a powerrsclew .between them,.arsocket constituting a journalbearing for Vthe screw and fitting ,over theends ofthe bars, a lock screw in .one side bar and a countersink in the socketgengaged by thescrew for securing the socket to the bars. Y. GUSTAV F. RICHTER.- 

